Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,720,616	$ 1,035,925
Grant funds receivable	25,014	266,248
Prepaid expenses and other current assets	48,262	42,301
Total current assets	1,793,892	1,344,474
Property and equipment, net of accumulated depreciation and amortization of $474,956 and $429,804 at September 30, 2013 and December 31, 2012, respectively	143,936	102,486
Other assets:
Licenses, net of accumulated amortization of $236,355 and $228,856 at September 30, 2013 and December 31, 2012, respectively	12,500	20,000
Deposits and other assets	11,010	11,010
Total other assets	23,510	31,010
Total assets	1,961,338	1,477,970
Current liabilities:
Accounts payable	85,291	163,788
Accrued expenses	120,014	33,877
Amounts payable to Emory University (a related party)	20,225	129,370
Total current liabilities	225,530	327,035
Commitments (Note 4)
Stockholders’ equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized; Series A Convertible Preferred Stock, $1,000 stated value; 788 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	312,196	312,196
Common stock, $0.001 par value, 75,000,000 shares authorized; 21,666,610 and 18,733,277 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	21,667	18,733
Additional paid-in capital	27,582,316	25,587,148
Deficit accumulated during the development stage	(26,180,371)	(24,767,142)
Total stockholders’ equity	1,735,808	1,150,935
Total liabilities and stockholders’ equity	$ 1,961,338	$ 1,477,970